A nurse is reviewing the medical record of a client who has a potassium level of 3.0 mEq/L. Which of the following findings should the nurse recognize as a potential causative factor?

Choice A rationale Excessive water intake, or psychogenic polydipsia, can lead to dilutional hyponatremia rather than a primary deficit in potassium levels. While significant fluid shifts can occur, the kidneys usually compensate by excreting dilute urine. Normal serum potassium ranges from 3.5 to 5.0 mEq/L. In this case, the client’s level of 3.0 mEq/L indicates hypokalemia. Drinking 4 liters of water daily is generally handled by healthy renal mechanisms without causing such a specific drop in potassium. Choice B rationale Most commercial salt substitutes are formulated using potassium chloride instead of sodium chloride to help patients reduce their sodium intake. Using these products typically increases the risk of developing hyperkalemia, where potassium levels exceed 5.0 mEq/L. It would not be a causative factor for this client’s hypokalemic state of 3.0 mEq/L. Consuming salt substitutes provides an exogenous source of the mineral, making a deficiency highly unlikely unless there were extreme malabsorption or concurrent diuretic use. Choice C rationale Nasogastric suctioning is a classic cause of hypokalemia because gastric fluids are rich in potassium, hydrogen, and chloride ions. Continuous removal of these secretions directly depletes the body’s potassium stores. Furthermore, the loss of gastric acid can lead to metabolic alkalosis, which causes an intracellular shift of potassium, further lowering the serum concentration below the normal 3.5 to 5.0 mEq/L range. The client’s level of 3.0 mEq/L is a direct consequence of these combined physiological losses. Choice D rationale Spironolactone is categorized as a potassium-sparing diuretic that acts as an aldosterone antagonist in the distal renal tubules. Unlike loop or thiazide diuretics, spironolactone inhibits the excretion of potassium, which usually results in an increase in serum levels. It is often prescribed to prevent or treat hypokalemia. Therefore, the use of this medication would not cause a low potassium level of 3.0 mEq/L but would instead be a reason for the level to stay high.